DB1065 User s Manual. MX465 CTCSS Encoder / Decoder Development Kit

Transcription

1 DB1065 User s Manual MX465 CTCSS Encoder / Decoder Development Kit MX-COM 1996

2 Table of Contents 1. General Information Introduction Warranty DB1065 Features Handling Precautions Static Protection Cleanliness Unpacking 4 2. Electrical Performance Absolute Maximum Ratings Operating Characteristics Prerequisites and Required Equipment Prerequisites Power Supply Limitations 6 3. Quick Start Introduction First Second - Setup Third - Select and Execute a Test CTCSS encoder verification Transmit audio path verification CTCSS decoder verification Receive audio path verification 8 4. Fourth - Explore Measuring CTCSS Encoder response time Measuring CTCSS Decoder response time Measuring CTCSS Decoder band width Measuring CTCSS response at different SINADs Performance at other operating voltages Connecting the DB1065 to a system TIA / EIA Hardware Introduction Description Functional Layout of Circuitry Connectors Logic Table for operation I/O Conditions CTCSS Programming Troubleshooting Suggestions If you still need help Retrofitting from older designs Comparison Specifications External Components Comparison MX-COM 1996 Page 2

3 9. Schematic Component layout 21 Table of Figures FIGURE 1: TEST EQUIPMENT CONNECTIONS 7 FIGURE 2: COMPOSITE TEST SIGNAL CIRCUIT DIAGRAM 10 FIGURE 3: TESTING AT DIFFERENT SUPPLY VOLTAGES 11 FIGURE 4: SUPPLY VOLTAGE VS TYPICAL SUPPLY CURRENT 12 FIGURE 5: BREAKING OUT SMALL CIRCUIT 13 FIGURE 6: COMPARISON OF EXTERNAL COMPONENTS FOR OLDER CTCSS ICS 19 FIGURE 7: DB1065 SCHEMATIC 20 FIGURE 8: COMPONENT VIEW ASSEMBLY DRAWING 21 FIGURE 9: SOLDER VIEW ASSEMBLY DRAWING General Information 1.1 Introduction This manual provides general information to support the installation and operation of the DB1065 Development Kit, a complete test platform to demonstrate and test the MX465 CTCSS encoder/ decoder. All trademarks and service marks are held by their respective owners. 1.2 Warranty The DB1065 hardware has been developed and is provided to help designers develop designs based on the MX465 CTCSS Encoder / Decoder IC. Every reasonable effort has been made to provide high quality and performance in pursuit of that goal. Toward that end, MX-COM, Inc. would value any suggestions to improve the DB1065 s manual and suggestions concerning the DB1065 s hardware design. Since experiments and designs are the responsibility of the DB1065 user, MX-COM, Inc. s liability regarding the use of the DB1065 is in all cases limited to the DB1065 purchase price. No other warranty is expressed or implied MX-COM 1996 Page 3

4 1.3 DB1065 Features The DB1065 Development Kit includes many useful features including those highlighted in Table. Features MX COM MiXed Signal CMOS Design 47 CTCSS Tones + Notone TX/RX Speech Filters Parallel Programming using Dip Switch Serial mode also available Meets TIA/EIA-603 Land Mobile Standard Improved SINAD Easy µp Interface Applications Mobile Radio Channel Sharing Repeater Control Wireless Intercom Traffic Control Hookswitch Supervision Simultaneous Voice Plus Control Signaling Remote Control Table 1 DB1065 Features 1.4 Handling Precautions Like most development boards, the DB1065 is designed for use in office and laboratory environments. The following practices will help ensure its proper operation Static Protection The DB1065 uses low power CMOS circuits which can be partially or completely damaged by electrostatic discharge. Partially damaged circuits can function erroneously and provide misleading test results which can be time consuming (and extremely frustrating) to resolve. Please observe common industrial static handling precautions when un-packing or handling the printed circuit board Cleanliness Because some DB1065 circuits are very high impedance, it is important to maintain their cleanliness. All flux and other contaminants should be thoroughly removed after making any additions or modifications to the circuit board. 1.5 Unpacking After reviewing the instructions in section 1.4, Handling Precautions, check to make sure that each of the following items are provided in the quantities indicated: Item Description Quantity 1. DB1065 User s Manual 1 2. DB1065 board 1 3. MX465 data sheet 1 2. Electrical Performance 2.1 Absolute Maximum Ratings Exceeding these maximum ratings can result in damage to the device. Operation of the device outside the operating limits is not implied MX-COM 1996 Page 4

5 Absolute Maximum Ratings Min. Max. Units Note B+ Supply Voltage input volts DC +5V Supply Voltage input volts DC Voltage on logic inputs or outputs volts DC 1 Voltage on analog input or outputs volts DC Storage Temperature C Operating Temperature C 2.2 Operating Characteristics For the following conditions unless otherwise specified: T=25C, DC supply voltage B+ = +12VDC, GND = 0V 0dB ref. = 750mVrms (VDD = 5VDC) Composite CTCSS test Signal: 300 mvrms 1KHz test tone, 75 mvrms band limited 6KHz gaussian white noise, 30 mvrms CTCSS tone Xtal Frequency = 4.0mhz, 100ppm max For additional Operation Characteristics refer to MX-COM MX465 data sheet Characteristic Minimum Typical Maximum Units Note Supply voltage B+ DC Supply Voltage Input VDC +5V DC Supply Voltage Input VDC DC Supply Current 6 10 ma Input Logic specifications for PTT, PTL, CS,MONITOR Input Low Voltage 1.50 VDC 1 Input High Voltage 3.50 VDC 1 Output Logic Specifications for DECODE (open collector output) Output Current (sink) 10 ma Analog Outputs TXOUT, RXOUT, TONEOUT Impedance 1000 TXOUT Level 750 mvrms RXOUT Level 500 mvrms TONEOUT Level 500 mvrms Analog Inputs TXIN, RXIN Impedance 1000 TXIN Level mvrms RXIN Level mvrms TX and RX Audio Filter Total Harmonic Distortion 2 5 %THD 2 Output Noise Level (input AC gnd) 2 mvrms Passband Hz Bandpass Ripple -1 1 db Passband Gain at 1KHz 0 db CTCSS Decoder Input signal level mvrms 2 Response Time 250 ms 3,4,5 Deresponse Time ms 3,4,5 Upper Decode Band Edge F i.995 F i+1 Hz 3, MX-COM 1996 Page 5

6 Characteristic Minimum Typical Maximum Units Note Lower Decode Band Edge F i F i Hz 3,6 Encoder Tone Output Level mvrms Tone Frequency Accuracy (f error) %f o Total Harmonic Distortion 2 5 %THD Notes 1 Valid for +5VDC on Vdd to the MX465 IC. 2 Measured referenced to 0dB= 1KHz tone referenced to 300 mvrms 3 Composite Signal Test Condition 4 f 0 >100Hz (for 100 Hz>f 0 >67Hz: t=100/f 0 Hz X 250ms) 5 Per TIA/EIA Only for the F i in TIA /EIA-603, where F i is the program tone. 2.3 Prerequisites and Required Equipment Prerequisites In order to effectively use the DB1065 Development Kit, the user should refer to the MX-COM data sheet for the MX Power Supply A user provided +12VDC regulated power supply is required to power the development card when connected to the B+ input. A regulated +5VDC supply is used when powering the DB1065 from the +5V input. 2.4 Limitations The DB1065 development board is designed to support the serial operation of the MX465 but the user must design and connect external hardware to use this function in the MX465. Refer to the MX465 data bulletin for additional assistance for using the MX465 in serial mode. All input and output analog and logic functions may be evaluated using the parallel mode of operation. 3. Quick Start 3.1 Introduction This section allows quick setup and test verification of the DB1065 Development Kit. 3.2 First... Review sections 1.4, Handling Precautions; 1.5, Unpacking and 2.4, Limitations sections above. (Quick start?!!) Don t worry, those sections are very short and help you to avoid damaging the DB1065 or your equipment. 3.3 Second - Setup a. Connect a +12VDC power supply to B+ and GND. b. Refer to Figure 1: Test Equipment Connections, on page 7 and Figure 7: DB1065 Schematic, on page 20 to connect test equipment to the DB1065 development board MX-COM 1996 Page 6

7 Analog Output Signals Connect to Audio Analyzer, Meter or Oscilloscope DB1065 Terminals +12VDC Power Supply + - Analog Inputs From Sine wave generators or noise source Optional Serial Interface Logic Level Inputs Logic Level input or output Logic level output Open Collector Figure 1: Test Equipment Connections 3.4 Third - Select and Execute a Test CTCSS encoder verification a. With the external power supply off, connect an oscilloscope or audio analyzer to TONEOUT. Ensure test equipment s ground is tied to GND on the DB1065. b. Set the dip switches D0-D5 for a CTCSS tone selected from Table 4: CTCSS Tones on page 17. c. Connect PTT to GND. d. Apply power. e. Adjust R3 for an amplitude of 300 mvrms. f. Measure the amplitude, frequency and or distortion of the CTCSS tone on TONEOUT. The frequency should correspond to the setting of the dip switch in reference to Table 4: CTCSS Tones starting on page MX-COM 1996 Page 7

8 3.4.2 Transmit audio path verification a. Using an audio signal generator, set for a 1KHz sine wave at 300 mvrms, connect the audio signal generator to TXIN. b. Connect an oscilloscope or audio analyzer to TXOUT. c. Measure the output level and calculate the gain difference between TXIN and TXOUT. 20*log Vin/Vout where Vin = TXIN and Vout = TXOUT. d. Calculate the level that represents -3 db below the output level at TXOUT for a 1khz sine wave. 3dB TXOUT which equals.707 X TXOUT = -3dB level e. Lower the frequency of the signal generator until the -3dB level is reached. f. Measure the output frequency of the signal generator. This will be the lower -3dB band edge of the TX audio filter. g. Raise the frequency of the signal generator until the -3dB level is reached. h. Measure the output frequency of the signal generator. This frequency will be the upper -3dB band edge of the TX audio filter. h. Remove ground from PTT. The 1KHz signal applied to TXIN should not be present at the TXOUT connection CTCSS decoder verification a. Remove ground from PTT. b. Measure the logic level on the MONIT0R output. With no CTCSS tone it should be greater than 3 volts dc. c. Connect an audio signal generator to RXIN. Adjust the audio generator s level to 50 mvrms and its frequency to equal the CTCSS tone frequency ( 1 hertz ) as set on the dip switch D0-D5 using Table 4: CTCSS Tones starting on page 17. d. Measure the logic level on the MONIT0 R output. It should be less than 1 volt dc when detecting a CTCSS tone. e. Connect CARRIER SENSE to +5VDC. MONIT0 R output should go to a hi logic level (>3VDC) Receive audio path verification a. Ensure PTT and PTL is not connected to ground. b. Using an audio signal generator, set for a 1khz sine wave at 300 mvrms, connect the audio signal generator to RXIN. c. Connect an oscilloscope or audio analyzer to RXOUT. d. Measure the output level and calculate the gain difference between RXIN and RXOUT. 20*log Vin/Vout where Vin = RXIN and Vout = RXOUT. e. Calculate the level that represents -3 db below the output level at RXOUT for a 1khz sine wave RXOUT or.707 X RXOUT = -3dB level f. Lower the frequency of the signal generator until the -3dB level is reached. g. Measure the output frequency of the signal generator. This will be the lower -3dB band edge of the RX audio filter. h. Raise the frequency of the signal generator until -3dB level is reached. i. Measure the output frequency of the signal generator. This will be the upper -3dB band edge of the RX audio filter. j. Connect ground to PTL. RX path audio should not be present at the RXOUT connection MX-COM 1996 Page 8

9 4. Fourth - Explore By using the basic verification tests for receive and transmit, the performance of the MX465 can be explored by varying the frequency and level of the audio input signals. The following examples provide additional tests that can be performed. 4.1 Measuring CTCSS Encoder response time Use the CTCSS encoder verification on page 7 to set up to test encoder response time. Connect one channel of a storage scope to PTT and another channel of a storage scope to TONEOUT. Set the scope to trigger on PTT. Connect and disconnect the PTT to ground and measure the time difference from PTT going from a logic level high to a logic low and a 90% steady level CTCSS tone amplitude output on TONEOUT. 4.2 Measuring CTCSS Decoder response time Use the CTCSS decoder verification on page 8 to set up to test decoder response time. Connect one channel of a storage scope to RXIN and another channel of a storage scope to MONIT0 R. Set the scope to trigger on RXIN. Turn the CTCSS tone off and on by connecting and disconnecting the signal generator. Measure the time difference from applying CTCSS tone to RXIN (where the CTCSS tone level reaches 90% of a full steady state level) to MONIT0R changing from a logic level hi to a logic level low ( were the logic level reaches 90% of steady low state). 4.3 Measuring CTCSS Decoder band width Use the CTCSS decoder verification on page 8 to set up to evaluate decoder bandwidth. Adjust the frequency of the audio generator above and below the CTCSS tone s center frequency and measure the band edge where MONIT0 R changes from a hi ( indicating no tone present) to a low ( indicating a CTCSS tone was detected). 4.4 Measuring CTCSS response at different SINADs A composite signal summing network can be bread boarded to simulate adverse signal conditions. This consists of an opamp with three summing nodes. Separate signal generators are used to simulate the 3 basic types of audio signals that may be present at RXAUDIO s input. One signal generator is used to simulate the CTCSS tone frequency and level. A noise generator that is 6khz band limited gaussian noise simulates background noise. The audio sine wave generator simulates the voice channel. A SINAD meter may be connected to the RXIN audio path to measure SINAD of the input signal to the MX465 s CTCSS decoder MX-COM 1996 Page 9

10 CTCSS tone generator CTCSS 30mvrms.1uF 100K Noise generator Noise 75mvrms, Band limited 6khz gaussian.1uf 100K Audio signal generator 1khz sine 300mvrms 100K +Vdd +Vdd.1uF 100K - + To RXIN and SINAD meter 100K.1uF 100K GND Audio Opamp 741 or similar GND Figure 2: Composite test signal circuit diagram Using the circuit above and setting the signal generators to the levels shown in the diagram simulates a CTCSS signal in a worst case condition. The performance of the DB1065 can be measured with a SINAD meter connected to RXIN while each signal generator is varied to simulate different signaling conditions. 4.5 Performance at other operating voltages The DB1065 s performance may be evaluated at supply voltages other than the +5VDC supplied from the on board regulator. a. Turn power supply off. b. Disconnect the power supply s connection to J1 the B+ connection on the DB1065. c. Set the power supply for an output of +5VDC. d. Turn power supply off and connect it to the +5V J12 of the DB1065. e. Turn on the power supply. As an example, a DB1065 was configured to detect a 67Hz CTCSS tone using the following configuration shown in Figure MX-COM 1996 Page 10

11 Oscilloscope J6 RXOUT audio from DB1065 CTCSS tone generator CTCSS 67Hz, 100mvrms Audio signal generator 1K 1KHz sine 300mvrms DB1065, J2 RXIN Variable Power Supply 1K 0 to +6VDC to J1, B+ on DB1065 GND, J13 on DB1065 GND, J13 on DB1065 DB and Gnd connections Ground J5, PTL on DB1065 Figure 3: Testing at different supply voltages Measuring supply current at different supply voltages in the configuration shown in Figure 3 would result in a typical graph as shown in Figure MX-COM 1996 Page 11

12 12 DB1065 / MX465 Vdd VS Typical Supply Current Typical Supply Current in ma Vdd applied Figure 4: Supply Voltage Vs Typical Supply Current Other performance characteristics may be measured and plotted in a similar manner. Please refer to the MX465 s specifications in section 2, Electrical Performance, on page 3 regarding maximum and minimum operating limits each device is tested to meet. Section 2 s information is used by the designer in regard to designing a circuit using the MX465 based on a device s electrical properties. 4.6 Connecting the DB1065 to a system The DB1065 may be connected to a radio system by connecting wires to the terminal strips or the DB1065 s smaller circuit may be broken out of the development board. Refer to Figure 5: Breaking Out Small Circuit, on Page 13. Before snapping the smaller circuit out the traces on the snap lines must be cut by carefully breaking off the three tabs containing the terminal strips and dip switch. Try and avoid bending or flexing the smaller circuit as the surface mount components are damaged easily. A set of tin snips can be also be used to cut out the smaller board and trim up the excess or rough edge left on the smaller board. Holes for soldering wires have been provided around the edge of the smaller inside circuit. Refer to Figure 8: Component view Assembly Drawing, to connect wires appropriately. Solder jumpers in the smaller circuit, E1 through E6, provide a method to select one CTCSS tone for operation. Refer to Figure 9: Solder View Assembly Drawing, for reference to solder jumpers MX-COM 1996 Page 12

13 #1 Cut traces on the score line on both sides of the PCB with knife #2 Snap apart or cut with tin snips #3 Cut traces on the score line on both sides of the PCB with knife #4 Snap apart or cut with tin snips #6 Snap apart or cut with tin snips #5 Cut traces on the score line on both sides of the PCB with knife Figure 5: Breaking Out Small Circuit 4.7 TIA / EIA 603 Additional performance measurements are detailed in TIA / EIA standard. Section 6 outlines Standards for Subaudible Signaling for Land Mobile FM or PM Communications Equipment. TIA / EIA standards may be obtained from (TIA s address) (EIA s address) Telecommunications Industry Association Electronic Industries Association 2001 Pennsylvania Ave. NW 1722 Eye Street, NW Suite 800 Suite 440 Washington, DC 2006 Washington, DC Phone: (202) Phone: (202) Fax: (202) Fax: (202) An alternative source is Global Engineering Documents, 15 Inverness Way East, Englewood, CO Phone: (800) (They accept Credit card orders) Global is a company that specializes in reprinting standards and is a good source to quickly get many types of standards MX-COM 1996 Page 13

14 5. Hardware 5.1 Introduction This section describes the PCB hardware and its adjustment. 5.2 Description Functional Layout of Circuitry The block diagram of the MX465 shown below shows internal connections to the MX465. Refer to Figure 7: DB1065 Schematic, on page 20 for external circuitry on the DB1065 circuit board Connectors Clamping connectors are distributed around the perimeter of the DB1065 motherboard as shown in Figure 8: Component view Assembly Drawing, on page 21. Silk-screen labels are provided on the motherboard to identify the connections listed in Error! Reference source not found.. Refer to Figure 7: DB1065 Schematic, on page 20 in reference to the electrical connections to the MX MX-COM 1996 Page 14

15 Name Ref. Desg. Description +B J1 This is the positive supply pin usually connected to +12VDC. RXIN J2 This is the input to the audio band pass filter in RX mode. TXIN J3 This is the TX Audio Input pin. In the TX mode it may be pre-filtered, using the TX audio path, Thus helping to avoid talkoff due to intermodulation of low frequency speech components with the transmitted CTCSS tone. TXOUT J4 This is the band pass filtered transmit audio output pin. In TX mode the pin outputs audio present at the TX audio input pin. PTL J5 In RX mode this pin operates as a "Push To Listen" function by enabling the RX audio path, thus overriding the tone squelch function. Tying PTL to ground will inhibite audio through the RX audio path till a CTCSS tone is decoded or No Tone is selected on D0-D5 RXOUT J6 This is the band pass filtered receive audio output pin. This pin outputs audio when RX tone DECODE is true or PTL is true or when Notone is programmed. PTT J7 Logic level input pulled low to enable transmitt mode. TONEOUT J8 The CTCSS sine wave output appears on this pin under control of the PTT input. The level is adjusted using R3. CARRIER SENSE J9 Input that can be connected to the radios carrier sense logic to enable the CTCSS decoder only when a carrier is present. DECODE J10 This is an open collector output used to mute the RX audio path or control squelch circuitry in a system. It provides a path to ground when a CTCSS tone is not present and is open collector when a CTCSS tone is detected. MONIT0R J11 This pin will have a +5VDC output till a CTCSS tone is detected. Alternatively this pin can be used to disable the open collector DECODE output pin and can be connected to a system s "Push To Listen", or MONIT0 R function. +5V J12 This pin is an alternative supply pin that can be connected to an external DC supply to evaluate performance of the MX465 at supply voltages below 7.0 VDC. GND J13 Connection to ground. SERIAL DATA J14 In serial operation, Data to control the MX465 is clocked in on this logic input. Refer to the MX465 s data sheet for operation. SERIAL CLOCK J15 Control data is clocked into the MX465 based on the rising and falling edge of this logic input. LOAD LATCH J16 Data is either in the process of loading into the MX465 control registers or is latched into the MX465 s internal registers using this logic input pin. Table 2: Connector Signal Descriptions MX-COM 1996 Page 15

16 6. Logic Table for operation 6.1 I/O Conditions Input Pin Condition D0-D5 PTT PTL CTCSS Tone in Output Pin Condition DECODE MONIT 0R Tone Transmitter Enabled TX Audio Path Enabled Result/Function Tone Decoder Enabled RX Audio Path Enabled Tone 0 0 X 0 1 Yes Yes No No (bias) 1 No Tone 0 X X 0 1 No (bias) Yes No No (bias) 2 Tone 1 0 No 0 1 No (bias) No Yes No (bias) 3a Tone 1 1 No 0 1 No (bias) No Yes Yes 3b Tone 1 X Yes o/c 0 No (bias) No Yes Yes 4 No Tone 1 X X o/c 0 No (bias) No Yes Yes 5 Table 3: Combinations of input/output conditions Notes Notes: o/c = Open circuit X = don t care 1. Normal tone transmit condition. 2. Notone programmed in TX mode, tone transmit O/P set to V DD /2. TX audio path enabled. 3a. Normal decode standby. 3b. Normal decode standby with PTL used to enable audio. 4. Normal decode of correct CTCSS tone condition, PTL has no effect. 5. Notone programmed in RX mode, tone transmit O/P (o/c). RX audio path enabled. 6.2 CTCSS Programming Nominal Frequency (Hz) Tone MX465 Frequency (Hz) f 0 (%) D5 (E6) Programming Inputs, Switch (Solder Jumper) D4 (E5) D3 (E4) D2 (E3) D1 (E2) D0 (E1) F F E F D E C E B D A D C C B Hex MX-COM 1996 Page 16

17 Nominal Frequency (Hz) Tone MX465 Frequency (Hz) f 0 (%) D5 (E6) Programming Inputs, Switch (Solder Jumper) B A A Notone N/A Serial input mode N/A 1 0 Data Clock X X 2X Not specified in the TIA/EIA tone set Table 4: CTCSS Tones D4 (E5) D3 (E4) D2 (E3) D1 (E2) D0 (E1) Hex 7. Troubleshooting Ideally, this section would not be required...however, sometimes the least expected (OK, the undesired) occurs. This section is intended to answer the most common questions and provide some helpful troubleshooting suggestions. 7.1 Suggestions Use an oscilloscope Because transmit and receive are biased a.c. signals, an oscilloscope is an invaluable troubleshooting tool to probe and verify signal levels Check for loose connections or jumpers MX-COM 1996 Page 17

18 Make sure the power supplies used are sufficiently noise free. Also make sure there are no unintended noise sources radiating into the test setup. 7.2 If you still need help If you have read this section, reexamined your test setup, and still cannot figure out what is wrong, please contact us for additional assistance. Please be ready to describe the problem or symptoms and the steps you have taken to try to correct them. We can be reached at MX-COM, Inc Bethania Station Rd. Winston-Salem, NC telephone (910) telephone (800) fax (910) Retrofitting from older designs The following is a brief list of differences between older generation MX-COM CTCSS encoder/decoders and the MX465. For full details refer to each device s individual data sheets. 8.1 Comparison Specifications CTCSS TONES Supply Voltage MX365 MX365A MX165A MX165B MX165C MX No tone 37 = EIA 220 A plus 97.4Hz Min: 4.5V Typ: 5.0V Max: 5.5V 39 + No Tone 37 = EIA 220 B plus 69.3Hz & 97.4Hz Min: 4.5V Typ: 5.0V Max: 5.5V 39 + No Tone 37 = EIA 220 B plus 69.3Hz & 97.4Hz Min : 3.0V Typ: 3.75V Max: 4.5V 39 + No Tone 39= TIA/EIA 603 Min: 3.0V Typ: 3.75V Max: 4.5V 47 + No Tone 39 = TIA/EIA 603 plus 159.8Hz, 183.5Hz, 189.9Hz, 196.6Hz, 199.5Hz, 206.5Hz, 229.1Hz, 254.1Hz Min: 2.75V Typ: 3.75/5.0V Max: 5.5V 47 + No Tone 39 = TIA/EIA 603 plus 159.8Hz, 183.5Hz, 189.9Hz, 196.6Hz, 199.5Hz, 206.5Hz, 229.1Hz, 254.1Hz Min: 2.75V Typ: 3.75/5.0V Max: 5.5V 0dB ref 300mVrms 308mVrms 100mVrms 100mVrms 750mVrms 750mVrms Composite Signal 0dB 1kHz test tone, -12dB noise (band limited 6kHz gaussian white noise), - 20dB f 0 CTCSS tone. 0dB 1kHz test tone, -12dB noise (band limited 6kHz gaussian white noise), - 20dB f 0 CTCSS tone. 0dB 1kHz test tone, -12dB noise (band limited 6kHz gaussian white noise), - 20dB f 0 CTCSS tone. 1kHz test tone at 300mVrms, 75mVrms noise (band limited 6kHz gaussian white noise), 30mVrms CTCSS tone. 0dB 1kHz test tone, -12dB noise (band limited 6kHz gaussian white noise), - 20dB f 0 CTCSS tone. 0dB 1kHz test tone, -12dB noise (band limited 6kHz gaussian white noise), - 20dB f 0 CTCSS tone MX-COM 1996 Page 18

19 8.2 External Components Comparison Figure 6: Comparison of External Components for Older CTCSS ICs EXTERNAL COMPONENTS MX365 MX365A MX165A MX165B MX165C MX465 R1 1M 1M 1M 1M 4.7M 4.7M R2 560k 560k 560k 560k 560k 560k R3 820k 820k 820k 820k 820k 820k X1 1MHz 1MHz 1MHz 1MHz 1MHz 4MHz C1 0.1uF 0.1uF 0.1uF 0.1uF 0.1uF 0.1uF C2 68pF 68pF 68pF 68pF 18pF 18pF C3 33pF 33pF 33pF 33pF 33pF 33pF C4 0.1uF 0.1uF 0.1uF 0.1uF 0.1uF 0.1uF C5 0.1uF 0.1uF 0.1uF 0.1uF 0.1uF 0.1uF C6 0.47uF 0.47uF 0.47uF 0.47uF 0.47uF 0.47uF C7 0.1uF 0.1uF 0.1uF 0.1uF 0.1uF 0.1uF C8 0.1uF 0.1uF 0.1uF 0.1uF 0.1uF 0.1uF C9 0.1uF 0.1uF 0.1uF 0.1uF 0.1uF 0.1uF C10 0.1uF 0.1uF 0.1uF 0.1uF 0.1uF 0.1uF C11 0.1uF 0.1uF 0.1uF 0.1uF 0.1uF 0.1uF D1 Small signal Small signal Small signal Small signal Small signal Small signal Resistors 10%, Capacitors 20%, Xtal 100ppm max Note : The values specified for R1, C2 and C3 have been found to be satisfactory when used with a crystal (X1) whose equivalent series resistance is to 1000 ohms. The crystal manufacturer should be consulted to determine optimum values for different crystals MX-COM 1996 Page 19

20 9. Schematic Figure 7: DB1065 Schematic MX-COM 1996 Page 20

21 10. Component layout Figure 8: Component view Assembly Drawing MX-COM 1996 Page 21

22 Figure 9: Solder View Assembly Drawing MX-COM 1996 Page 22

23 CML Microcircuits COMMUNICATION SEMICONDUCTORS CML Product Data In the process of creating a more global image, the three standard product semiconductor companies of CML Microsystems Plc (Consumer Microcircuits Limited (UK), MX-COM, Inc (USA) and CML Microcircuits (Singapore) Pte Ltd) have undergone name changes and, whilst maintaining their separate new names (CML Microcircuits (UK) Ltd, CML Microcircuits (USA) Inc and CML Microcircuits (Singapore) Pte Ltd), now operate under the single title CML Microcircuits. These companies are all 100% owned operating companies of the CML Microsystems Plc Group and these changes are purely changes of name and do not change any underlying legal entities and hence will have no effect on any agreements or contacts currently in force. CML Microcircuits Product Prefix Codes Until the latter part of 1996, the differentiator between products manufactured and sold from MXCOM, Inc. and Consumer Microcircuits Limited were denoted by the prefixes MX and FX respectively. These products use the same silicon etc. and today still carry the same prefixes. In the latter part of 1996, both companies adopted the common prefix: CMX. This notification is relevant product information to which it is attached. CML Microcircuits (USA) [formerly MX-COM, Inc.] Product Textual Marking On CML Microcircuits (USA) products, the MX-COM textual logo is being replaced by a CML textual logo. Company contact information is as below: CML Microcircuits (UK)Ltd COMMUNICATION SEMICONDUCTORS Oval Park, Langford, Maldon, Essex, CM9 6WG, England Tel: +44 (0) Fax: +44 (0) uk.sales@cmlmicro.com CML Microcircuits (USA) Inc. COMMUNICATION SEMICONDUCTORS 4800 Bethania Station Road, Winston-Salem, NC 27105, USA Tel: , Fax: us.sales@cmlmicro.com CML Microcircuits (Singapore)PteLtd COMMUNICATION SEMICONDUCTORS No 2 Kallang Pudding Road, 09-05/ 06 Mactech Industrial Building, Singapore Tel: Fax: sg.sales@cmlmicro.com D/CML (D)/2 May 2002